Running Win7 64Bit with 64Bit JDK7u21 as administrator and i'm using updatesite "http://download.eclipse.org/eclipse/updates/4.3milestones".
My anti-virus has an exception for my hole eclipse folder.
I checked all handles (processes) using 'eclipse.exe' and there 'eclipse.exe' itself, 'java.exe' and 'csrss.exe' (Client/Server Runtime Subsystem from Windows, its used for the console and threading under Windows).